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Physics > Moments > Flashcards

Moments Flashcards

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1
Q

What is the unit for mass

A

Kg

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2
Q

What is the unit for weights

A

Newtons N

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3
Q

What is a lever

A

A simple machine which uses a pivot

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4
Q

What is a moment

A

A moment is a turning effect of a force around a pivot

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5
Q

What is the equation for moments

A

Moments = Force x Perpendicular Distance

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6
Q

Unit of force

A

Newton

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7
Q

Unit of moment

A

Newton metre

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8
Q

Why does something topple

A

when weight acts outside the base of the object

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9
Q

When is the mechanical advantage for a lever

A

When only a small effort is needed to balance a large load

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10
Q

What is the principle of moments

A

For a balanced system(in equilibrium) the sum of all the clockwise moments equals the sum of all anti-clockwise moments

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11
Q

What is the centre of gravity

A

It is the point which the mass/weight appears to act from
It is the average position of mass

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12
Q

When is an object stable

A

When weight acts inside the base of an object

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13
Q

What are two things that make something stable

A

A low centre of gravity or a wide footprint

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14
Q

What are forces

A

A push or pull

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15
Q

What can they change

A

Shape speed or direction

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16
Q

What is hookes law

A

The force applied to an elastic material is directly proportional to its extension up to the elastic limit

17
Q

What is the equation that links extension, force applied and spring constant

A

Force applied = spring constant x extension

18
Q

What is elastic behaviour

A

When unloaded it returns to its original shape

19
Q

What is plastic behaviour

A

When unloaded it shows perminent deformation and doesn’t return to its original shape

20
Q

What is the point called where the object stops behaving elastically and starts behaving plastically

A

Elastic limit

21
Q

Where is the elastic limit on the graph

A

When the line of best fit stops being straight

22
Q

What does a stiff spring have

A

A large spring constant

23
Q

What is gradient

A

Rise over run

24
Q

What is spring constant measured in

A

Nm or Ncm

Physics (3 decks)

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